Effectively purifies air in small rooms 100-200 square feet. AeraSmart(TM) Sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified. True HEPA filter with AeraSafe(TM) antimicrobial treatment safely removes 99.97% of airborne particles as small as 0.3 microns, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores and cigarette smoke Extremely effective at capturing influenza virus from indoor air ( based on independent testing) Fan speed indicator lets you manually adjust the fan speed setting - low, medium, or high. Ultra quiet operation Fan speed indicator lets you manually adjust the fan speed setting - low, medium, or high. Ultra quiet operation. AeraMax Fellowes AearMax 100/DX5 Air Purifier